Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 310, Issue 2, Pages 1479-1481Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2006.10.624
Keywords
ferromagnetic ordering; organic magnet; Heisenberg ferromagnetic chain; magnetic susceptibility; specific beat
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An organic magnet beta-BBDTA (.) GaBr4 shows a ferromagnetic transition at T-C = 0.42 K that is a typical long-range ordering of the Heisenberg S = 1/2 ferromagnetic chains with intra-chain interaction of 2J(F) = 8.7 K, induced by only a ferromagnetic inter-chain interaction of 2zJ' = 0.29 K. A sample with impurity shows a transition at 0.3 K that is 0.12 K lower than that of the pure sample. The impurity that was contained in the synthesis is considered to be the gamma-phase that is an antiferromagnet of anti ferromagnetic chains. The amount of the impurity is estimated to be about 20%. In terms of the mean field calculation, the reduction of T-C corresponds to a smaller inter-chain interaction to be 2zJ' = 0.2 K . (c) 2006 Elsevier B.V. All rights reserved.
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